Advanced Java - Interview Questions and Answers

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73. What is the difference between the String and StringBuffer classes?

String objects are constants. StringBuffer objects are not constants.

74. If a variable is declared as private, where may the variable be accessed?

A private variable may only be accessed within the class in which it is declared.

75. What is an object's lock and which object's have locks?

An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock.

All objects and classes have locks. A class's lock is acquired on the class's Class object.

76. What is the Dictionary class?

The Dictionary class provides the capability to store key-value pairs.

77. How are the elements of a BorderLayout organized?

The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container.

78. What is the % operator?

It is referred to as the modulo or remainder operator. It returns the remainder of dividing the first operand by the second operand.